Energy conversion technologies towards self-powered electrochemical energy storage systems: the state of the art and perspectives

Wei, Huige; Cui, Dapeng; Ma, Jun; Chu, Li‐Qiang; Zhao, Xiaoyu; Song, Haixiang; Liu, Hu; Liu, Tao; Wang, Ning; Guo, Zhanhu

doi:10.1039/c6ta09726j

Cited by 125 publications

(68 citation statements)

References 180 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, enormous attention and research enthusiasm have been devoted to high dielectric (high-k) materials for their wide applications in actuators [1,2], antennas [3], capacitors [4][5][6][7], wave-transparent (or absorbing) devices [8][9][10][11][12][13], and other electronic devices [14][15][16][17][18][19][20][21][22]. Most conventional highk materials are ceramic or ceramic composites, but their applications are seriously restricted by their intrinsic frangibility, high density, poor plasticity, and low breakdown strength.…”

Section: Introductionmentioning

confidence: 99%

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Mao

Shi

Wang

et al. 2018

Adv Compos Hybrid Mater

View full text Add to dashboard Cite

The search for high-performance dielectric materials has long been driven by the urgent needs for various modern electronics. However, enhanced permittivity is always accompanied by elevated loss, which seriously hinders the development and applications of dielectric materials. Herein, negative-k layers were introduced into layer-structured films, forming a new class of multilayer composites consisting of alternately stacked positive-k and negative-k layers. Compared with traditional multilayer composites without negative-k layers, the layered composites containing extra positive-k/negative-k interfaces exhibit superior ability in balancing the contradict parameters: permittivity and loss, yielding substantially enhanced permittivity without sacrificing the low loss. It is indicated that the permittivity was enhanced by the charge accumulations and reinforced polarizations on the interfaces between positive-k and negative-k layers. Meanwhile, the loss induced by the leakage current was suppressed by the blocked transport of carriers between adjacent layers. The trilayered 60-3.5-60 composite exhibits an enhanced dielectric constant (ε′ ≈ 33 @10 kHz) and retained low loss (tanδ ≈ 0.12 @10 kHz) compared with the single-layer BT/PVA composite containing 60 wt% BT fillers (ε′ ≈ 9.5 @10 kHz, tanδ ≈ 0.075 @10 kHz). This research offers an effective way to design and fabricate novel high-performance dielectric materials.

show abstract

Section: Introductionmentioning

confidence: 99%

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Mao

Shi

Wang

et al. 2018

Adv Compos Hybrid Mater

View full text Add to dashboard Cite

show abstract

“…Mode I is currently the most common way which is applicable to all types of energy conversion and storage technologies, however, the energy loss from electrical resistance is inevitable due to the required external circuit. In comparison, Modes II and III have no external circuits, however, are relatively sophisticated owing to the unique working principle and/or difficulty in integrating the energy conversion and storage processes . Therefore, the integration of energy harvesting and storage depends on the service conditions (eg, location, temperature, and mechanical and optical conditions), size limits, life constraints and power and energy requirements.…”

Section: Power Supply Systems For the Ioementioning

confidence: 99%

Advances in the development of power supplies for the Internet of Everything

Fan

Liu

et al. 2019

InfoMat

105

View full text Add to dashboard Cite

The Internet of Everything (IoE), which aims to realize information exchange and communications for anything with the Internet, has revolutionized our modern world. Serving as the driving force for devices in the IoE network, power supply systems play a fundamental role in the development of the IoE. However, due to the complexity, multifunctionality and wide‐scale deployment of diverse applications, power supply systems face great challenges, including distribution, connection, charging technologies, and management. In this review, some challenges and advances in the development of both power supply systems and their units are presented. In the overall system‐level field, establishing sustainable and maintenance‐free power supply systems through wireless connections, efficient power management and integrated energy harvesting and storage systems is highlighted. Additionally, the main performance metrics of power supply units are discussed, including energy density, service life, and self‐power ability. In addition, some directions of power quality assessment for both the system and unit levels of power supply systems are presented, aiming to provide insight into the future development of high‐performance power supply systems for the IoE.

show abstract

“…Rigid polyurethane foam (RPUF) has been widely used as insulating materials, construction panel sandwich structures, cushions of furniture and packaging materials in automobiles, transportation, energy storage and electromagnetic interference shielding fields due to its high mechanical properties, insulated properties, etc . However, one of its major defects is its flammability, which limits its further applications .…”

Section: Introductionmentioning

confidence: 99%

Flame‐retardant rigid polyurethane foam with a phosphorus‐nitrogen single intumescent flame retardant

Wang

et al. 2017

Polymers for Advanced Techs

Self Cite

232

138

View full text Add to dashboard Cite

A phosphorous-nitrogen intumescent flame-retardant, 2,2-diethyl-1,3-propanediol phosphoryl melamine (DPPM), was synthesized and characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance. Flame-retardant rigid polyurethane foams (RPUFs) with DPPM (DPPM-RPUF) as fire-retardant additive were prepared. Scanning electron microscope (SEM) and mechanical performance testing showed that DPPM exhibited a favorable compatibility with RPUF and negligibly negative influence on the mechanical properties of RPUF. The flame retardancy of DPPM on RPUF was investigated by the limiting oxygen index (LOI), vertical burning test and cone calorimeter. The LOI of DPPM-RPUF could reach 29.5%, and a UL-94 V-0 rating was achieved, when the content of DPPM was 25 php. Furthermore, the DPPM-RPUF exhibited an outstanding water resistance that it could still obtain a V-0 rating after water soaking. Thermogravimetric analysis showed that the residual weight of RPUF was relatively low, while the charring ability of DPPM-RPUF was improved greatly. Real-time Fourier transform infrared spectroscopy was employed to study the thermo-oxidative degradation reactions of DPPM-RPUF. The results revealed that the flame-retardancy mechanism of DPPM in RPUF was based on the surface charred layer acting as a physical barrier, which slowed down the decomposition of RPUF and prevented the heat and mass transfer between the gas and the condensed phases. storage and electromagnetic interference shielding fields due to its high mechanical properties, insulated properties, etc. 1-4 However, one of its major defects is its flammability, which limits its further applications. 5,6 The improvement of the flame retardancy of RPUF has currently been an important subject among the developments of new polymer foam materials. 7,8 Traditionally, the main flame retardants for RPUF are the halogen-based compounds such as pentabromodiphenyl ether, chloroethylphosphate, etc, which may endow RPUF excellent flame retardation. 9 However, when burning, such retardants release a lot of toxic gases which pollute environment and damage people's health. 10-14 Thus, the environmentally-friendly flame-retardant additives with good flame retardancy are particularly needed. In recent years, the phosphorus-nitrogen intumescent flame retardants (IFR) have been widely used as halogen-free additives because they provide excellent fire protection with less smoke and lower toxicity. 15,16 Traditional IFRs are mixtures, which usually consist of an acid source (eg, ammonium polyphosphate), a carbonizing agent (eg, pentaerythritol, sorbitol) and a foaming agent (eg, melamine). The IFRs system usually experiences an intense expansion and forms protective charred layers that serve as a physical barrier to protect the underlying material from flux or flame. 14,15 In spite of many advantages, IFRs have 2 issues, ie, low water solubility and high thermal stability. 17 In addition, they are poorly compatible with the RPUF matrix, which weakens the mechanical properties of ...

show abstract

Energy conversion technologies towards self-powered electrochemical energy storage systems: the state of the art and perspectives

Abstract: Mythology? Reality? Innovative technologies have achieved the conversion and storage of renewable energies as the hero did in Chinese myths.

Cited by 125 publications

References 180 publications

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Advances in the development of power supplies for the Internet of Everything

Flame‐retardant rigid polyurethane foam with a phosphorus‐nitrogen single intumescent flame retardant

Contact Info

Product

Resources

About